<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>Vue 测试实例 - 菜鸟教程(runoob.com)</title>
  <script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
</head>

<body>
  <div id="app">
    <div id="counter-event-example">
      <p>{{ total }}</p>
      <!-- 将incrementTotal(slot)与increment(signal)绑定 -->
      <button-counter v-on:increment="incrementTotal"></button-counter>
      <button-counter v-on:increment="incrementTotal"></button-counter>
    </div>
  </div>

  <script>
    Vue.component('button-counter', {
      template: '<button v-on:click="incrementHandler">{{ counter }}</button>',
      data: function () {
        return {
          counter: 0
        }
      },
      methods: {
        incrementHandler: function () {
          this.counter += 1
          // 自定义事件increment, 发送信号
          this.$emit('increment')
        }
      },
    })
    new Vue({
      el: '#counter-event-example',
      data: {
        total: 0
      },
      methods: {
        incrementTotal: function () {
          this.total += 1
        }
      }
    })
  </script>
</body>

</html>